Screw-lock



/ W a j W. H. CLOPTON.

SCREW LOCK.

APPLICATION FILED NOV. 25. I919.

1,350,139, Patented Aug. 17,1920.

awwutaz (Mung UNITED STATES PATE T, OFFICE...

WILLIAM H. oLorroN, or wAsHnveToiI, Di s'rnror or comma .SCREW-LOCK.

Specification of Letters Patent. Patented Ailg, 17, 1920.

Application filed November 25, 1919. Serial No. 340,446.

It is often desirable when employing screws as fastening means to insureagainst their accidental loosening or removal, and

it is object of this invention to provide a device which, while beingsimple in character and consequently economical to manufacture, willsatisfactorily serve this purpose and may be readily employed inconnection with screws of the usual type without, in any way, mutilatingthe screw to adapt it to the lock.

In the accompanying drawings in which are shown two forms which myinvention may take, it being understood that the invention may beembodied in other forms,

Figure 1 is a top plan view of my lock showing it as used with a screw,

Fig. 2 is a sectional view taken on the line 22 of Fig. 1,

Fig. 3 is a bottom plan view of the lock detached from the screw, r

Fig. 4 is a top plan view of the lock shown in Fig. 1 detached from thescrew, Fig. 5 is a vertical sectional view of modified form of lock, and

' Fig. 6 is a bottom plan view of the form shown in'Fig. 5.. i

Referring to the drawings in more detail and having particular referenceto Figs. 1 and 2, 10 indicates a screw having the usual flared head 9adapted to be countersunk in j the work W.

A look is shown as a washer-like annulus 1 adapted to be countersunk inthe work so that its surface lies flush with the material into which thescrew is to be inserted, and is provided with means for holding it infixed position, the means employed, in this instance, being twolaterally disposed wings 2. At substantially its center, the lock isprovided with an opening, 3 to receive the screw, and to provide a neatfit for the screw head, there is formed around the opening, acountersink 4.

As shown in Fig. 2, the lock has'located thereon an upstanding flange 5,surrounding the countersink 4 and opening 3, and serving as the means tofixedly connect the screw and the lock 1. The flange 5, as well as theentire lock member, may be formed of a relatively soft metal although,in order to serve the purpose of the present invention, it is onlynecessary that the flange be formed of the soft metal. After the screwis placed in operative position, as shown in Fig. 2, a portion of theflange, at the end of the head slot 6 of the screw, may be superimposedon the screw head or, as shown being done in any suitable manner, as bya chisel or the like. 7

In the form of my device'shown in Fig. 5, the lock is provided with atubular shank 7, which will serve to satisfactorily guide the screw intothe work and thus afford a lock which may be found to be of moresuitable structure'in certain classes of work. In this form ofmy device,the wings 8 extend to the end of the shank but operate in the samemanner as in the form shown in Figs. land 2.

It will beobserved that I have provided a screw lock which will be veryeconomical to manufacture and will, by reason of its p in Fig. 1,disposed within the head slot, this fixed connection to the work and thescrew, insure the latter against accidental loosening andremoval. It is,of course, understood that such modifications may be made in the devicesshown'in the accompanying drawings as come within the scope of thefollowing claims wherein I define my i11- vention.

What is claimed is:

1. A look for screws, having a countersink for a screw head, a memberadapted to be inserted into the material into which the screw is to beplaced, andan upstanding fixedly securing the shell in position, andrelativelysoft metal surrounding the coun-. means adapted to bedisplaced into thescrew tersink and adapted to have portionsdishead-slot, said means comprising an upplaced overthe screw head. 10standing flange of relatively soft metal. In testimony whereof Ihavehereunto set 4. A screw lock consisting of a central my hand.countersink for the screw head, Wings adapted to enter the Work, and aflange of I WILLIAM CLOPTON.

